Optimum by Sealy Posturpedic features OptiCool gel memory foam, the only gel memory foam on the market to be fused with OUTLAST, which is more effective at removing excess heat. OUTLAST material is used in high performance outdoor gear, undergarments, and even footwear for superior temperature regulation. Optimum is designed to absorb motion, creating a calm, stable sleeping environment that lasts all night , every night. All Optimums are built and designed in the USA.